Check this out:
"Mid 90's Nissan 3.0 engines may develop a ticking noise in the valve train which sounds like valve lifters. Before declaring bad valve lash, take a jumper wire and ground the solenoid controlling the variable valve timing gear. It is pretty obvious -- sticking up out of the valve cover. You only need access to one -- the easiest one(for a change) because they are in series. grounding the solenoid traps the oil in the gears.
With the engine idling, and the noise present, ground the lead. If the noise goes away, you have found the problem. Nissan has a TSB for this: Replace just the spring. According to my sources, however, it is better to replace the entire gear. The spring doesn't always fix the problem, but replacing the gear assembly will. Do the job once, and the customer pays -- do the job a second time and someone pays (not always the customer -- at least willingly)."
Its a tech tips page from a mechanic out in Sedona, AZ.
Hey all,
I like most owners of a older pathfinder am familiar with the noise of the leaking manifold. I am also the proud owner of a mysterious tapping noise that some mechanics call valve tap, others call piston slap and still others bad rod bearings. No one will give me a solid aswer to the question of what is that noise.
It is definately louder at startup, but never quite goes away. At idle it soulds like a diesel only slower and quieter, something which other people including complete strangers have told me as well. It does not seem to effect performance. I swear that when I bought it it was much quieter, I don't know if that was something the stealer did or if it was becasue it had been on the lot for a while, but within a month or so it was present and quite noticeable.
I was checking out the wd21 forums when i came accross a link that led to the above info.
Has anyone ever heard of this? Does it apply to the engine in my '95? I guess I'll find out. I'm going to try it thisweekend
let me know if you all have heard of this or if it is BS
thanks and have a good night
http://www.asaaz.org/canyonauto/techtips.htm#nissan%203.0